Cleaning fuel tank vent

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Cleaning fuel tank vent

Postby Eric David » Tue May 19, 2020 11:11 am

Hello all,

We're experiencing uneven fuel feed from our fuel tanks on Oyster Catcher. It appears the engne feeds mostly from the port tank. Fuel levels are normally a little off but it's quite noticeable now. We've inspected/replaced the relevant valves and filters and all is well but the imbalance continues. We've played around with the return valves too but the issue persists. Normally we run with all valves open and have tried closing the starboard tank return valve but to no avail either.

Once we're stopped the fuel levels in the tanks even out like they should.

About the only thing I haven't done is chech the tank vents. Has anyone done this before and do you have any hints?

Thanks!
Eric
Oyster Catcher
Hull #132
Eric David
 
Posts: 51
Joined: Tue Jun 03, 2014 11:01 am

Re: Cleaning fuel tank vent

Postby rbunz » Tue May 19, 2020 4:00 pm

Eric,

You will know vents are clogged during a refilling. When we first bought our boat the detailer had plugged the vents with polish. When we went to fill at anything over a trinkle the fuel splurged out of the fill. Took a few minutes to diagnose the problem but once we cleaned out the little clamshell vents, filling was back to normal and it only splurges at the end of the fill. If you still want to check yours the clamshell is two screws then run a wire into the vent.

I think you are experiencing a normal Camano problem. I run with the Starboard return shut 90% and it still burns uneven. I wish the builder would have built in a crossover line with an isolation valve.

//Rick
WildHare
rbunz
 
Posts: 154
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Re: Cleaning fuel tank vent

Postby Eric David » Tue May 19, 2020 8:36 pm

rbunz wrote:
> Eric,
>
> You will know vents are clogged during a refilling. When we first bought
> our boat the detailer had plugged the vents with polish. When we went to
> fill at anything over a trinkle the fuel splurged out of the fill. Took a
> few minutes to diagnose the problem but once we cleaned out the little
> clamshell vents, filling was back to normal and it only splurges at the
> end of the fill. If you still want to check yours the clamshell is two
> screws then run a wire into the vent.
>
> I think you are experiencing a normal Camano problem. I run with the
> Starboard return shut 90% and it still burns uneven. I wish the builder
> would have built in a crossover line with an isolation valve.
>
> //Rick
> WildHare

Thanks Rick!

I don't have any problem with fueling so perhaps the vent is clear. When you say clamshell, is that the chrome thing on the exterior of the hull? I don't see any screws on it.

Eric
Oyster Catcher
Eric David
 
Posts: 51
Joined: Tue Jun 03, 2014 11:01 am

Re: Cleaning fuel tank vent

Postby rbunz » Wed May 20, 2020 7:45 am

Wild Hare is a 1999 so they may have changed the vents but mine look like this. //Rick
Attachments
vent.jpg
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rbunz
 
Posts: 154
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Re: Cleaning fuel tank vent

Postby rwidman » Wed May 20, 2020 9:13 am

Unscrew the stainless steel vent cover and look for any blockage. If you find any, do your best to clear it without letting any debris go inside towards the tank. A shop vacuum would be good for this.
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Location: Charleston, SC

Re: Cleaning fuel tank vent

Postby Eric David » Wed May 20, 2020 3:11 pm

rbunz wrote:
> Wild Hare is a 1999 so they may have changed the vents but mine look like
> this. //Rick

Thanks Rick!

Ours are little different (O.C. was built in 2000), but will check some more. The imbalance is less severe than before, our engine actually quit about a month ago from fuel starvation but I suspect air got in the fuel system and just made things worse. Serves me right for driving from upstairs where there are no fuel gauges... :lol:

Eric
Oyster Catcher
Hull #132
Eric David
 
Posts: 51
Joined: Tue Jun 03, 2014 11:01 am

Re: Cleaning fuel tank vent

Postby Sea Muse » Thu May 21, 2020 6:30 am

Good morning Erik: My boat is a 2003 model and the tank vents are black plastic/nylon. The outside visible portion of this vent unscrews. I broke one off towing a boat alongside and replaced only that outboard piece. For balancing fuel tanks, I run with the return to the starboard tank completely closed and the port return completely open, works fairly well. We're talking TAMD41P-A
Sea Muse
 
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Re: Cleaning fuel tank vent

Postby Eric David » Thu May 21, 2020 7:52 am

Thanks Sea Muse!

That's how we're running now as well.

Eric
Oyster Catcher
Hull #132
Eric David
 
Posts: 51
Joined: Tue Jun 03, 2014 11:01 am

Re: Cleaning fuel tank vent

Postby jhance » Thu May 21, 2020 4:53 pm

Yes fuel imbalance issue is corrected by playing with the return valves. Close or partially close the return valve to the tank that is more full.
Jamey Hance
Audrey Grace #188
Orcas Island, WA
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